2 * Quota code necessary even when VFS quota support is not compiled
3 * into the kernel. The interesting stuff is over in dquot.c, here
4 * we have symbols for initial quotactl(2) handling, the sysctl(2)
5 * variables, etc - things needed even when quota support disabled.
9 #include <linux/namei.h>
10 #include <linux/slab.h>
11 #include <asm/current.h>
12 #include <linux/uaccess.h>
13 #include <linux/kernel.h>
14 #include <linux/security.h>
15 #include <linux/syscalls.h>
16 #include <linux/capability.h>
17 #include <linux/quotaops.h>
18 #include <linux/types.h>
19 #include <linux/writeback.h>
21 static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
25 /* these commands do not require any special privilegues */
33 /* allow to query information for dquots we "own" */
36 if ((type == USRQUOTA && uid_eq(current_euid(), make_kuid(current_user_ns(), id))) ||
37 (type == GRPQUOTA && in_egroup_p(make_kgid(current_user_ns(), id))))
41 if (!capable(CAP_SYS_ADMIN))
45 return security_quotactl(cmd, type, id, sb);
48 static void quota_sync_one(struct super_block *sb, void *arg)
50 int type = *(int *)arg;
52 if (sb->s_qcop && sb->s_qcop->quota_sync &&
53 (sb->s_quota_types & (1 << type)))
54 sb->s_qcop->quota_sync(sb, type);
57 static int quota_sync_all(int type)
61 if (type >= MAXQUOTAS)
63 ret = security_quotactl(Q_SYNC, type, 0, NULL);
65 iterate_supers(quota_sync_one, &type);
69 static int quota_quotaon(struct super_block *sb, int type, int cmd, qid_t id,
72 if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_on_meta)
74 if (sb->s_qcop->quota_on_meta)
75 return sb->s_qcop->quota_on_meta(sb, type, id);
78 return sb->s_qcop->quota_on(sb, type, id, path);
81 static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
85 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
86 if (!sb_has_quota_active(sb, type)) {
87 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
90 fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
91 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
92 if (copy_to_user(addr, &fmt, sizeof(fmt)))
97 static int quota_getinfo(struct super_block *sb, int type, void __user *addr)
99 struct if_dqinfo info;
102 if (!sb->s_qcop->get_info)
104 ret = sb->s_qcop->get_info(sb, type, &info);
105 if (!ret && copy_to_user(addr, &info, sizeof(info)))
110 static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
112 struct if_dqinfo info;
114 if (copy_from_user(&info, addr, sizeof(info)))
116 if (!sb->s_qcop->set_info)
118 return sb->s_qcop->set_info(sb, type, &info);
121 static inline qsize_t qbtos(qsize_t blocks)
123 return blocks << QIF_DQBLKSIZE_BITS;
126 static inline qsize_t stoqb(qsize_t space)
128 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
131 static void copy_to_if_dqblk(struct if_dqblk *dst, struct qc_dqblk *src)
133 memset(dst, 0, sizeof(*dst));
134 dst->dqb_bhardlimit = stoqb(src->d_spc_hardlimit);
135 dst->dqb_bsoftlimit = stoqb(src->d_spc_softlimit);
136 dst->dqb_curspace = src->d_space;
137 dst->dqb_ihardlimit = src->d_ino_hardlimit;
138 dst->dqb_isoftlimit = src->d_ino_softlimit;
139 dst->dqb_curinodes = src->d_ino_count;
140 dst->dqb_btime = src->d_spc_timer;
141 dst->dqb_itime = src->d_ino_timer;
142 dst->dqb_valid = QIF_ALL;
145 static int quota_getquota(struct super_block *sb, int type, qid_t id,
153 if (!sb->s_qcop->get_dqblk)
155 qid = make_kqid(current_user_ns(), type, id);
158 ret = sb->s_qcop->get_dqblk(sb, qid, &fdq);
161 copy_to_if_dqblk(&idq, &fdq);
162 if (copy_to_user(addr, &idq, sizeof(idq)))
167 static void copy_from_if_dqblk(struct qc_dqblk *dst, struct if_dqblk *src)
169 dst->d_spc_hardlimit = qbtos(src->dqb_bhardlimit);
170 dst->d_spc_softlimit = qbtos(src->dqb_bsoftlimit);
171 dst->d_space = src->dqb_curspace;
172 dst->d_ino_hardlimit = src->dqb_ihardlimit;
173 dst->d_ino_softlimit = src->dqb_isoftlimit;
174 dst->d_ino_count = src->dqb_curinodes;
175 dst->d_spc_timer = src->dqb_btime;
176 dst->d_ino_timer = src->dqb_itime;
178 dst->d_fieldmask = 0;
179 if (src->dqb_valid & QIF_BLIMITS)
180 dst->d_fieldmask |= QC_SPC_SOFT | QC_SPC_HARD;
181 if (src->dqb_valid & QIF_SPACE)
182 dst->d_fieldmask |= QC_SPACE;
183 if (src->dqb_valid & QIF_ILIMITS)
184 dst->d_fieldmask |= QC_INO_SOFT | QC_INO_HARD;
185 if (src->dqb_valid & QIF_INODES)
186 dst->d_fieldmask |= QC_INO_COUNT;
187 if (src->dqb_valid & QIF_BTIME)
188 dst->d_fieldmask |= QC_SPC_TIMER;
189 if (src->dqb_valid & QIF_ITIME)
190 dst->d_fieldmask |= QC_INO_TIMER;
193 static int quota_setquota(struct super_block *sb, int type, qid_t id,
200 if (copy_from_user(&idq, addr, sizeof(idq)))
202 if (!sb->s_qcop->set_dqblk)
204 qid = make_kqid(current_user_ns(), type, id);
207 copy_from_if_dqblk(&fdq, &idq);
208 return sb->s_qcop->set_dqblk(sb, qid, &fdq);
211 static int quota_setxstate(struct super_block *sb, int cmd, void __user *addr)
215 if (copy_from_user(&flags, addr, sizeof(flags)))
217 if (!sb->s_qcop->set_xstate)
219 return sb->s_qcop->set_xstate(sb, flags, cmd);
222 static int quota_getxstate(struct super_block *sb, void __user *addr)
224 struct fs_quota_stat fqs;
227 if (!sb->s_qcop->get_xstate)
229 ret = sb->s_qcop->get_xstate(sb, &fqs);
230 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
235 static int quota_getxstatev(struct super_block *sb, void __user *addr)
237 struct fs_quota_statv fqs;
240 if (!sb->s_qcop->get_xstatev)
243 memset(&fqs, 0, sizeof(fqs));
244 if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */
247 /* If this kernel doesn't support user specified version, fail */
248 switch (fqs.qs_version) {
249 case FS_QSTATV_VERSION1:
254 ret = sb->s_qcop->get_xstatev(sb, &fqs);
255 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
261 * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them
262 * out of there as xfsprogs rely on definitions being in that header file. So
263 * just define same functions here for quota purposes.
265 #define XFS_BB_SHIFT 9
267 static inline u64 quota_bbtob(u64 blocks)
269 return blocks << XFS_BB_SHIFT;
272 static inline u64 quota_btobb(u64 bytes)
274 return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT;
277 static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src)
279 dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit);
280 dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit);
281 dst->d_ino_hardlimit = src->d_ino_hardlimit;
282 dst->d_ino_softlimit = src->d_ino_softlimit;
283 dst->d_space = quota_bbtob(src->d_bcount);
284 dst->d_ino_count = src->d_icount;
285 dst->d_ino_timer = src->d_itimer;
286 dst->d_spc_timer = src->d_btimer;
287 dst->d_ino_warns = src->d_iwarns;
288 dst->d_spc_warns = src->d_bwarns;
289 dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit);
290 dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit);
291 dst->d_rt_space = quota_bbtob(src->d_rtbcount);
292 dst->d_rt_spc_timer = src->d_rtbtimer;
293 dst->d_rt_spc_warns = src->d_rtbwarns;
294 dst->d_fieldmask = 0;
295 if (src->d_fieldmask & FS_DQ_ISOFT)
296 dst->d_fieldmask |= QC_INO_SOFT;
297 if (src->d_fieldmask & FS_DQ_IHARD)
298 dst->d_fieldmask |= QC_INO_HARD;
299 if (src->d_fieldmask & FS_DQ_BSOFT)
300 dst->d_fieldmask |= QC_SPC_SOFT;
301 if (src->d_fieldmask & FS_DQ_BHARD)
302 dst->d_fieldmask |= QC_SPC_HARD;
303 if (src->d_fieldmask & FS_DQ_RTBSOFT)
304 dst->d_fieldmask |= QC_RT_SPC_SOFT;
305 if (src->d_fieldmask & FS_DQ_RTBHARD)
306 dst->d_fieldmask |= QC_RT_SPC_HARD;
307 if (src->d_fieldmask & FS_DQ_BTIMER)
308 dst->d_fieldmask |= QC_SPC_TIMER;
309 if (src->d_fieldmask & FS_DQ_ITIMER)
310 dst->d_fieldmask |= QC_INO_TIMER;
311 if (src->d_fieldmask & FS_DQ_RTBTIMER)
312 dst->d_fieldmask |= QC_RT_SPC_TIMER;
313 if (src->d_fieldmask & FS_DQ_BWARNS)
314 dst->d_fieldmask |= QC_SPC_WARNS;
315 if (src->d_fieldmask & FS_DQ_IWARNS)
316 dst->d_fieldmask |= QC_INO_WARNS;
317 if (src->d_fieldmask & FS_DQ_RTBWARNS)
318 dst->d_fieldmask |= QC_RT_SPC_WARNS;
319 if (src->d_fieldmask & FS_DQ_BCOUNT)
320 dst->d_fieldmask |= QC_SPACE;
321 if (src->d_fieldmask & FS_DQ_ICOUNT)
322 dst->d_fieldmask |= QC_INO_COUNT;
323 if (src->d_fieldmask & FS_DQ_RTBCOUNT)
324 dst->d_fieldmask |= QC_RT_SPACE;
327 static int quota_setxquota(struct super_block *sb, int type, qid_t id,
330 struct fs_disk_quota fdq;
334 if (copy_from_user(&fdq, addr, sizeof(fdq)))
336 if (!sb->s_qcop->set_dqblk)
338 qid = make_kqid(current_user_ns(), type, id);
341 copy_from_xfs_dqblk(&qdq, &fdq);
342 return sb->s_qcop->set_dqblk(sb, qid, &qdq);
345 static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src,
348 memset(dst, 0, sizeof(*dst));
349 dst->d_version = FS_DQUOT_VERSION;
351 if (type == USRQUOTA)
352 dst->d_flags = FS_USER_QUOTA;
353 else if (type == PRJQUOTA)
354 dst->d_flags = FS_PROJ_QUOTA;
356 dst->d_flags = FS_GROUP_QUOTA;
357 dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit);
358 dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit);
359 dst->d_ino_hardlimit = src->d_ino_hardlimit;
360 dst->d_ino_softlimit = src->d_ino_softlimit;
361 dst->d_bcount = quota_btobb(src->d_space);
362 dst->d_icount = src->d_ino_count;
363 dst->d_itimer = src->d_ino_timer;
364 dst->d_btimer = src->d_spc_timer;
365 dst->d_iwarns = src->d_ino_warns;
366 dst->d_bwarns = src->d_spc_warns;
367 dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit);
368 dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit);
369 dst->d_rtbcount = quota_btobb(src->d_rt_space);
370 dst->d_rtbtimer = src->d_rt_spc_timer;
371 dst->d_rtbwarns = src->d_rt_spc_warns;
374 static int quota_getxquota(struct super_block *sb, int type, qid_t id,
377 struct fs_disk_quota fdq;
382 if (!sb->s_qcop->get_dqblk)
384 qid = make_kqid(current_user_ns(), type, id);
387 ret = sb->s_qcop->get_dqblk(sb, qid, &qdq);
390 copy_to_xfs_dqblk(&fdq, &qdq, type, id);
391 if (copy_to_user(addr, &fdq, sizeof(fdq)))
396 static int quota_rmxquota(struct super_block *sb, void __user *addr)
400 if (copy_from_user(&flags, addr, sizeof(flags)))
402 if (!sb->s_qcop->rm_xquota)
404 return sb->s_qcop->rm_xquota(sb, flags);
407 /* Copy parameters and call proper function */
408 static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
409 void __user *addr, struct path *path)
413 if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS))
416 * Quota not supported on this fs? Check this before s_quota_types
417 * since they needn't be set if quota is not supported at all.
421 if (!(sb->s_quota_types & (1 << type)))
424 ret = check_quotactl_permission(sb, type, cmd, id);
430 return quota_quotaon(sb, type, cmd, id, path);
432 if (!sb->s_qcop->quota_off)
434 return sb->s_qcop->quota_off(sb, type);
436 return quota_getfmt(sb, type, addr);
438 return quota_getinfo(sb, type, addr);
440 return quota_setinfo(sb, type, addr);
442 return quota_getquota(sb, type, id, addr);
444 return quota_setquota(sb, type, id, addr);
446 if (!sb->s_qcop->quota_sync)
448 return sb->s_qcop->quota_sync(sb, type);
451 return quota_setxstate(sb, cmd, addr);
453 return quota_rmxquota(sb, addr);
455 return quota_getxstate(sb, addr);
457 return quota_getxstatev(sb, addr);
459 return quota_setxquota(sb, type, id, addr);
461 return quota_getxquota(sb, type, id, addr);
463 if (sb->s_flags & MS_RDONLY)
465 /* XFS quotas are fully coherent now, making this call a noop */
474 /* Return 1 if 'cmd' will block on frozen filesystem */
475 static int quotactl_cmd_write(int cmd)
490 #endif /* CONFIG_BLOCK */
493 * look up a superblock on which quota ops will be performed
494 * - use the name of a block device to find the superblock thereon
496 static struct super_block *quotactl_block(const char __user *special, int cmd)
499 struct block_device *bdev;
500 struct super_block *sb;
501 struct filename *tmp = getname(special);
504 return ERR_CAST(tmp);
505 bdev = lookup_bdev(tmp->name);
508 return ERR_CAST(bdev);
509 if (quotactl_cmd_write(cmd))
510 sb = get_super_thawed(bdev);
512 sb = get_super(bdev);
515 return ERR_PTR(-ENODEV);
519 return ERR_PTR(-ENODEV);
524 * This is the system call interface. This communicates with
525 * the user-level programs. Currently this only supports diskquota
526 * calls. Maybe we need to add the process quotas etc. in the future,
527 * but we probably should use rlimits for that.
529 SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
530 qid_t, id, void __user *, addr)
533 struct super_block *sb = NULL;
534 struct path path, *pathp = NULL;
537 cmds = cmd >> SUBCMDSHIFT;
538 type = cmd & SUBCMDMASK;
541 * As a special case Q_SYNC can be called without a specific device.
542 * It will iterate all superblocks that have quota enabled and call
543 * the sync action on each of them.
547 return quota_sync_all(type);
552 * Path for quotaon has to be resolved before grabbing superblock
553 * because that gets s_umount sem which is also possibly needed by path
554 * resolution (think about autofs) and thus deadlocks could arise.
556 if (cmds == Q_QUOTAON) {
557 ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path);
559 pathp = ERR_PTR(ret);
564 sb = quotactl_block(special, cmds);
570 ret = do_quotactl(sb, type, cmds, id, addr, pathp);
574 if (pathp && !IS_ERR(pathp))